1, it may be that the phone does not recognize the charger's fast charging function, you can first check whether the charging head is red rice original fast charging head, and then see if the data cable is intact, you can replace the data cable to try.
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2, if the above method can not be solved, you can first use the battery of the phone to automatically shut down, and then plug in the original charger to charge, do not turn on, and keep the shutdown charging, until the breathing light turns green 100% power and then turn on. Slow charging, no fast charging may be your phone in USB charging, this method can be switched to AC charging, that is, fast charging.
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3, you can also enter the phone's \"Settings\" select \"About the phone\" in the \"MIUI version\
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4, if the above methods are still unable to use fast charge after trying, you can only get the phone to the after-sales point for maintenance.